gnpatterson

I did this stuff decades ago and thought I'd never forget it, but I have. You are looking at tricky question. It looks almost like the definition of the standard potential in which case the answer would be 0.76V HOWEVER looking closely I see that the concentration of H+ is 0.001 M so I must use the Nernst equation. I have got to get the equation balanced and everything That is way TOO difficult for my old old brain, fortunately google gives the answer on http://www.science.uwaterloo.ca/~cchieh/cact/c123/nernsteq.html this exact example is used and the equation is 3/4 ways down the page, just slot the numbers in and you have it.

No I think, there is no need to assume ideal gas as both samples are at STP yt2095 is correct this is simple proportionality The next logical step would be to calculate the average molar mass on the assumption that it is an ideal gas. At 5.075 g/L it is about 4 times denser than air so it is something with an average molecular mass of 5.075 * 22.4 = 114 this is pretty heavy for a gas but not the heaviest (uranium hexafloride spings to mind) a halo-carbon would be my bet

Thanks, spotted my mistake. Is there any significance to this problem? I notice that you have placed a number of x's that do not interfere with the solution, do they have some meaning in a wider problem?

by cheating I mean I resorted to using google and excel I decided i didnt know enough and went to mathworld to learn about the mcnugget numbers and realised that I could learn it all quickly enough so I did a site search for some of the numbers and found the sequence that this sequence is based on. Spotting how it was modified was easy as I had already been trying a zillion sequences that used this as a key. PS I think the next is 344 but will tell you that 274 was almost a prime candidate for being the next one

Got IT! by cheating of course would the next be 212?

I gave up looking for myself and decided to cheat. I used http://www.research.att.com/~njas/sequences/ (the on-line dictionary of integer sequences) but even it could not "get" it!! This must be pretty hard so I admit defeat, go on tell us the answer, please.

thanks then I'll assume it is something combinatorial and it has a plane of symmetry (or some sort of reflection) because all the number are even Am I warm?

I think the point of this excercise is that it is (for neurologically typical people) suprisingly difficult. It is a a feature of normal (with literacy) consciousness that our brain automatically processes written information and presents us with the abstraction for further processing. the experience of the difficulty of the excercise illustrates how normal people don't get to choose which information "channel" to listen to. It is difficult to switch off the reading centre of the brain which pushes the abstraction of a colour (the wrong one) into your brain. In particular you should experience that the operation of the "reading" channel is faster at processing the "stream" of information. i.e. you are processing the reading of the second and third words while you are still speaking the first. If you are presented with a "stream" of color cards (allowed to see the up coming cards) you arent as quick at saying the colours cf reading them ie you can linguistically deal with a colour "concept" without reference to the sense memory. but if you are flashed words or just colours you just as quick at identifying them. It is a feature of how your brain works (or how most peoples brains work) Some groups of people would have less difficulty with the excercise eg. if english was not their first language or more exotically if they had more direct access to the visual processing areas through an atypical neurological link up. such a person might be unusually conscious of the colour of objects that normal people simply filter out of their consciousness. I'm not convinced that this is even speculatively possible without doing some research into where the "colour" sense is located but I know that letter recognition is closely linked with the (left?) fusiform gyrus. I am aware of autistic people that have direct access to other sensory processing areas that allow them to perform such interference inhibited tasks with ease. Equally there are people with senistasia that can process colour associative tasks that normals can't.

Can you assure us it is mathematical? is it perhaps cultural or historical like the ages of the pharohs in the second era or the spacing in days between British bank holidays.

sorry I dont follow this problem and I get far more ways to do it by writting in each box how many ways there are to get to it you can go down the grid row by row as shown here | | | | | |o | | | | | | ------------------------------ | x| | | |1 |1 |1 |x | | | | ------------------------------ | | | x|1 |2 |x |2 |1 | |x | | ------------------------------ | | | 1| 3|3 |5 |3 |3 |x |x |x | ------------------------------ | x| x| x| 7|11|11|11|6 |3 |1 | | ------------------------------ | 1| 0| 8| 18|29|33|28|20|10| 4| 1| ------------------------------ this gives a total of 152 ways (i get 50 at the previous row) PS what is gd (class)

by "how high the water goes up" I take it you are talking about the fountaining of the resulting jet of water. the conditions you describe are the classical conditions to set up a quasi-steady flow. (you have a lot of water in a big tank) the choice of water in and the diameters given indicate that the flow is a low renyolds number flow i.e. viscosity is not important (I could be wrong here as I havent done the calculation just made a guess.) thus bernoulli is in effect this tells us, in simple terms, that the velocity of the water coming out of the pipe will be given by the conversion of potential to kinetic energy. Again bernoulli tells us how high the spouts will rise. they should both rise to the height of top level of the tank again it is simple conservation of energy. HOWEVER End effects do apply to the diameter of the pipe I WILL neglect these in my argument. to help you to "see" that the two spouts rise to the same hieght simply do a thought experiment, Imagine a thick pipe with water pouring out of it and mentally add a wall down the center of the of the pipe. You can mentally divide the pipe and tank in half, as long as the tank remains "large" and the viscousity can be neglected then the flow of the thick pipe can be seen as the flows of a number of thin pipes running in parallel. (this is the arguement galilao used for dropping stones) If you want to take viscousity and the surface tension into account it would require more than the value of a pint to motivate anyone.